Xepoch

Xepoch is pronounced zep′-uhk.

Xepoch is the concatenation
of two primary words of interest in the Unix philosophy. X
is from
The X Window System that (despite some shortcomings) reverses
the logical concepts between servers and clients. X is distributed
computing at heart.
The Epoch is known of course as Midnight 1 January 1970 GMT,
and the numer of absolute seconds elapsed since is a key metric that
can ease timeseries data modeling and date arithemetic.